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(No Model.) 2 Sheets-Sheet 1.

R. E. NEVIN. SAW MILL SET WORKS.

No. 425,386. Patented Apr. 8, 1890.

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(No Model.) 2 Sheets-Sheet 2.

' R. E. NEVIN.

SAW MILL SET WORKS.

- Patented Apr.. 8, 1890.

mus versus co, morpnmu wnsmxarow n c UNITED STATES PATENT OFFICE.

ROBERT E. NEVIN, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO THE VULQAN IRON WORKS, OF SAME PLACE.

SAW-MILL SET-WORKS.

SPECIFICATION forming part of Letters Patent No. 425,386, dated April 8, 1890. Application filed September 6, 1889. Serial No. 323,168. (No model.)

To all whom it may concern:

Be it known that I, ROBERT E. NEVIN, of the city and county of San Francisco, State of California, have invented an Improvement in Saw-Mill Set-WVorks; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to an improved sawmill set-works.

It consists in the combinatiomwith the carriage, of oppositely-rotating ratchet-wheels connected, respectively, with pinions whereby the setting-gear is moved constantly in one direction, a lever and pawls whereby the ratchet-wheels are moved, stops by which the movement of the lever and the amount of set is regulated, and foot-levers and mechanism for operating the stops, and a means whereby the pawls may be thrown out of engagement with the ratchets, together with certain details of construction.

Referring to the accompanying drawings for a more complete explanation of my invention, Figure l is a plan view of my device'with its connections. Fig. 2 is an end elevation of the same. Fig. 3 is a front elevation of the same.

A is the log-carriage.

B is one of the head-blocks.

C is the screw-shaft by which the standard of one of the head-blocks is advanced, this shaft being rotated by means of the miter gear-wheels D and E. fixed to the shaft 0, and the other is fixed to a hollow sleeve Gr, through which the-shaft 0 passes. Upon the same sleeve is fixed a ratchet-wheel H, and upon the shaft 0, by the side or a little distance from the wheel H, is a second ratchet-wheel H. These ratchet-wheels have teeth so arranged as to be engaged by pawls, so as to be rotated in opposite directions. a

I is a lever having one end journaled so that the lever may move about the shaft 0 as a center of its rotation, and this lever carries the pawls J and K, which engage, respectively, the two ratchetwheels H and H. It will be manifest that when the lever I is moved in one direction one of these pawls will rotate its ratchet-wheel, while the other One of these Wheels is tation of the wheel H will turn the pinion,-

which is rigidlyconnected on the same sleeve G. The pinion E meshes with the miter-gear S, which is keyed to the set-shaft F, and again the gear S meshes with the gear D on the screw-shaft C, and by these connections the screw-shaft G is advanced in the desired direction. Now when the lever is returned the pawl K of the wheel H will engage it, and through it the shaft C will be turned in thesame direction. The wheel H, being freed from its pawl, will simply turn loosely on the shaft 0 in the opposite direction by means of the connection with the gear S, the latter being rotated in this case by the gear D.

L is an arm projecting from the hub of the lever I, and M M M M are stops which may be raised so that either one of them will intercept this arm L and prevent further motion of the lever I. These stops are arranged at proper distances around the periphery of the circle in which the armL moves, so that when the first one is raised up to intercept the arm it will limit the advance of the screw and the head-block, and a certain known advance will be made by each movement of the lever. If

the second one be raised, the first one being allowed to drop out of line with the moving arm, another and different degree of advancement will be given, and so on. These stops are each connected with a foot-lever N, the latter being hung from across-shaft Q, so that the operator by simply placing his foot on either of the levers may raise the stop which he desires to use, and, knowing what the advance is when the lever is brought down to.

this stop, he can calculate how far the headblock will be advanced.

When the lever is raised up, the arm L strikes a permanent stop 0, which limits its motion in the opposite direction.

When it is desired to throw the pawls out of engagement with the ratchet, it is done by means of the curved arm P. This arm is also journaled loosely on the shaft Q and is raised by means of a hand-lever B. This arm, as above described, curves so that it lies beneath the points of the pawls, being extended just between the two ratchet-wheels H and H, these being separated from each other sufficiently for the purpose, and when the lever B is pressed down the arm will be raised and the pawls thrown out of engagement, so as to allow the standards of the head blocks to be I run back without interruption! the saw-kerf. An offset WV is formed on the end of the head-block, with which this screw comes in contact on its downstroke.

Having thus described myinvention,whatI claim as new, and desire to secure by Letters Patent, is-

1. In a saw-mill set-works, the combination, with the head-blocks, standards movable thereon, and screws by which said standards are advanced or retracted, of a bevel gearwheel D, fixed to the screw-shaft, a second bevel-gear E, facing the first one and turning loosely upon the outward extension of the screw-shaft, a set-shaft extending between the head-blocks and having a bevel gear-wheel S fixed to it and meshing with the gears D and E, a ratchet-wheel H, fixed to rotate upon the screw-shaft in unison with the loose gear E, a second ratchet-wheel H, fixed to the extension of the screw-shaft parallel with the wheel 11, and a lever fulcru med upon the screw-shaft and carrying pawls' which engage the ratchet-wheels, so as to turn them in opposite direction when the lever is reciprocated about its fulcrum, substantially as herein described.

.2. In a saw-mill set-works, the head-block, the standard movable thereon, and the screw by which it is advanced or retracted, a bevel gear-wheel D, fixed upon the screw-shaft, a

second bevel-gear E, turning loosely upon the outward extension of the shaft, a bevel-gear fixed to the set-shaft at right angles with the screw-shaft and meshing with the gears D and E, a ratchet-wheel fixed to turn in unison with the loose gearE, and a second ratchetfixed to the screw-shaft parallel with the loose one, in combination with a lever I, fulcrumed upon the screw-shaft and carrying pawls which engage the two ratchet-wheels, so as to turn them in opposite directions, a curved lifter P between the ratchet-wheels below the pawls and fulcrumed upon a shaft Q, and a lever B, engaging the lifter P, so that the latter raises both sets of pawls at once, substantially as herein described.

3. The screw-shaft of a saw-millset-works, the fixed and loose bevel-gears and the gear S at right angles meshing with them, the fixed and loose ratchet-wheels mounted upon the screw-shaft, the lever fulcrumed" upon the screw-shaft, carrying pawls which engage the teeth of the two ratchet-wheels, and the arm L, moving in unison with the lever, in, combination with a fixed stop 0 at one end of the are of travel of the arm, the movable stops M at the opposite end of the arc, and the foot-levers N, by which the stops are independently actuated, substantially as herein described.

4. The screw-shaft of a saw-mill set-works, the fast and loose bevel-gears D E, the fast and loose ratchet-wheels H H, the bevelgear S at right angles and. meshing with the gears D E, and the lever I, fulcrumed upon the screw-shaft, carrying pawls which engage the ratchet-wheels, so as to rotate them in opposite. directions, in combination with the fixed and adjustable setting-stops, the screw U, and the stop WV, substantially as herein described. y

In witness whereof I have hereunto set my hand.

ROBERT E. NEVIN.

\Vitnesses: S. lL-Noonsn, H. 0. LEE. 

